javascript replace char if not present another character

var x = Math.sqrt(num); Here is what the above code is Doing: 1. We’re creating a variable called num and assigning it the value of 16. 2. We’re creating a variable called x and assigning it the value of the square root of num.

function autoIncrementCustomId(lastRecordId){ let increasedNum = Number(lastRecordId.replace(‘ABC’,”)) + 1; let kmsStr = lastRecordId.substr(0,3); for(let i=0; i< 6 - increasedNum.toString().length; i++){ kmsStr = kmsStr+'0'; } kmsStr = kmsStr + increasedNum.toString(); console.log(kmsStr); } autoIncrementCustomId('ABC009999') Here is what the above code is Doing: 1. It takes the last record id and removes the first 3 characters from it. 2....

npm install -g ios-deploy # Run on a connected device, e.g. Max’s iPhone: react-native run-ios –device “Max’s iPhone” Here is what the above code is Doing: 1. Install the ios-deploy package globally. 2. Run the app on a connected device.

Here is what the above code is Doing: 1. The line tells the browser to load the main.js file as a module. 2. The main.js file is loaded as a module, and the browser will wait until the module is loaded before it continues to parse the HTML. 3. The main.js file imports the greet.js…

var answers = [ “Hey”, “Howdy”, “Hello There”, “Wotcha”, “Alright gov’nor” ] var randomAnswer = answers[Math.floor(Math.random() * answers.length)]; console.log(randomAnswer); Here is what the above code is Doing: 1. We create an array called answers. 2. We create a variable called randomAnswer. 3. We use Math.random() to generate a random number between 0 and 1. 4….

const fs = require(‘fs’); const readline = require(‘readline’); async function processLineByLine() { const fileStream = fs.createReadStream(‘input.txt’); const rl = readline.createInterface({ input: fileStream, crlfDelay: Infinity }); // Note: we use the crlfDelay option to recognize all instances of CR LF // (‘\r\n’) in input.txt as a single line break. for await (const line of rl) {…